Intelligent design and creationism each approach the origins question differently, although they both reject the theory of evolution. But supporters and opponents of intelligent design (ID) disagree on how closely related the two are. Design opponents generally regard ID as an aspect of creationism, on the grounds that ID's proponents are religious allies of creationism proponents. They also cite court rulings.[1] But in addition to confusing ID with creationism this stance also ignores the distinction between Young Earth and Old Earth Creationism. Most of the time when people say creationism the mean the first kind:

"Christian creationists believe God created animals, humanity, Earth and the universe in their original form in six days about 6,000 years ago, a literal interpretation of the Book of Genesis in the Bible." [1]

Atheists and believers both agree that if life has been designed, then this implies the existence of a Designer or Creator. Accordingly, philosophers who deny the possibility of supernatural causation are hostile to ID because it undermines one of atheism's primary arguments against the existence of God.

Other quotes

Opponents maintain that proving intelligent causes or agents is not science but rather the study of theology and philosophy. [3]

References

↑ 1.01.1U.S. District Judge John E. Jones barred a Pennsylvanian public school district from teaching "intelligent design" in biology class, saying the concept is creationism in disguise. Fox News - December 12, 2008

↑"Its only program for man is scientific breeding, a system under which a few supposedly superior intellects, self-appointed, would direct the mating and the movements of the mass of mankind -- an impossible system!"-William Jennings Bryan[1]